activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:baselineAligned="false"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:background="#3F51B5"
        android:orientation="vertical"
        android:padding="8dp">

        <TextView
            android:id="@+id/tv_results_bmi"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="0"
            tools:text="23.7"
            style="@style/TextAppearance.AppCompat.Display4" />

        <TextView
            android:id="@+id/tv_results_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="-16dp"
            android:layout_marginBottom="16dp"
            android:text="@string/label_enter_weight_height"
            tools:text="Ideal Weight"
            style="@style/TextAppearance.AppCompat.Subhead" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="horizontal"
        android:baselineAligned="false"
        android:showDividers="middle"
        android:divider="@android:drawable/divider_horizontal_bright"
        android:padding="8dp">

        <RelativeLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@color/primary"
            android:padding="8dp">

            <EditText
                android:id="@+id/et_height"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:inputType="numberDecimal"
                android:hint="@string/label_height"
                android:gravity="center"
                android:textSize="24sp" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/et_height"
                android:layout_centerHorizontal="true"
                android:text="@string/unit_meter"
                style="@style/TextAppearance.AppCompat.Small"
                android:id="@+id/tv_height_unit" />

        </RelativeLayout>

        <RelativeLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@color/primary"
            android:padding="8dp">

            <EditText
                android:id="@+id/et_weight"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:inputType="numberDecimal"
                android:hint="@string/label_weight"
                android:gravity="center"
                android:textSize="24sp" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/et_weight"
                android:layout_centerHorizontal="true"
                android:text="@string/unit_kilogram"
                style="@style/TextAppearance.AppCompat.Small"
                android:id="@+id/et_weight_unit" />

        </RelativeLayout>

    </LinearLayout>

</LinearLayout>